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<?php
$total=20;//红包总金额   
$num=10;// 分成10个红包，支持10人随机领取   
$min=0.01;//每个人最少能收到0.01元   
 $redpack = new redpack($total,$num,$min);
 $jieguo = $redpack->getPack();
 foreach($jieguo as $key=>$val){
	 $n = $key+1;
	 echo '第'.$n.'个红包：'.$val['money'].' 元，余额：'.$val['balance'].' 元<br>';   
 }

class redpack{
	//总金额
	private $total=0;
	//红包数量
	private $num=0;
	//最小红包金额
	private $min=0.01;
	
	public function __construct($total,$num,$min)
	{
		$this->total = $total;
		$this->num = $num;
		$this->min = $min;
	}
	//红包结果
	public function getPack()
	{
		$total = $this->total;
		$num = $this->num;
		$min = $this->min;
		for ($i=1;$i<$num;$i++)   
		{   
			$safe_total=($total-($num-$i)*$min)/($num-$i);//随机安全上限   
			$money=mt_rand($min*100,$safe_total*100)/100;   
			$total=$total-$money;  
			//红包数据
			$readPack[]= [
				'money'=>$money,
				'balance'=>$total,
			];
		}
		//最后一个红包，不用随机		
		$readPack[] = [
			'money'=>$money,
			'balance'=>0,
		];
		//返回结果
		return $readPack;
	}
	
}